Only show first 5 versions of module on page load

[hobofan]

CLOSES #16 (and #24 if merged before #25)

• Only shows the 5 most recent versions of a module on page load
• Below them, there is now a "Show all N versions" button, which will make the list expand to the full list of versions
  • I opted for the simple one-time click rather than pagination, as it is a lot simpler to implement and reason about